If it has been a while since you fed your starter, then you will need to feed it 8 hours before baking to ensure it has at least doubling in size, which means it is strong enough to make the bread rise. If you have been feeding your starter regularly, you can use it straight from the fridge as long as it has been fed within 7 days.
Place 4 1/4 cups of flour and 2 tsp of sea salt in a large mixing bowl.
Measure a heaping 1/3 cup of the starter in a dry measuring cup. It will be quite sticky. Add the starter to the water, after a couple of seconds it should float, which means your starter is strong and active.
Whisk the starter and the water together until the starter is dissolved and you have a murky liquid.
Mix the wet and dry ingredients with a rubber spatula (Spoonula) until a shaggy dough begins to form. The dough will be quite stiff and at this point you may wish to ditch the spatula and use your hands.
Using your hands (with disposable gloves), knead the dough until all of the flour is incorporated and there are no dry streaks or lumps. If the dough is sticking to your gloves (and to the sides of the bowl), add more flour, 2 TBSP at a time and work it into the dough.
Continue to add a bit more flour until the dough no longer sticks to your gloves or the sides of the bowl.
Continue to knead the dough until it is fairly smooth and form it into a ball.
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Cover the dough with plastic wrap or a damp kitchen towel and allow to proof for at least 8 and up to 12 hours in a warm place free of drafts. The ideal temperature is 70-80*.
After "proofing" your dough should have risen and approximately doubled. It should have a curved dome and look a bit like a distended belly. If you gently poke it with a floured finger, it should slowly come back.
Line a clean bowl with baking parchment. Make sure to use a parchment that can take high heat, as you will be baking at 450-475*. I prefer the brand IF YOU CARE, available at Whole Foods, Target, Amazon and many other specialty stores and buy the pre-cut sheets, which are so much easier to work with.
With wet fingers (or using gloves), scrape the dough away from the bowl and gather it into a ball. Grabbing one side, lift it with both hands and raise it high above the bowl and allow it to stretch. As it returns to the bowl, fold it over itself. It will be sticky, but should not be too loose or stick to the bowl once you gather it together. If it is sticking to the bowl, add a touch more flour, a tablespoon at a time.
Wait about 90 seconds and repeat the stretching 2 more times. (During the 3rd stretch, the dough may not stretch as high and may require you to pull from all sides.) After the 3rd stretch, mound the dough into the parchment lined bowl, shaping it so the "seam" is on the bottom. Dust the dough lightly with flour and place in the refrigerator while you heat your dutch oven.
At this point you may refrigerate your dough for up to 3 days before baking.
Heat oven to 475* (or 450* on convection setting, which is what I use).
Place the dutch oven (covered) in the oven while it is preheating and allow it to heat for 45 minutes to an hour.
When the oven is ready, remove the dough from the refrigerator. Using kitchen shears or a very sharp knife, cut a long slice in the top of the dough or several slices to make an X or flower pattern.
Carefully remove the dutch oven and remove the lid. Lift the dough by the corners of the parchment and place in the dutch oven. (I leave the dutch oven on the rack and remove the lid, drop in the dough and replace the lid.)
Cover and bake for 25 minutes.
Remove lid and bake for an additional 15-20 minutes until dark golden brown.
Remove to a rack and allow to cool for an hour before slicing.